Backup alarm



FIG. 1 is a right, front and top perspective view of a backup alarm in accordance with our design;

FIG. 2 is a left, front and top perspective view thereof;

FIG. 3 is a right, rear and top perspective view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a right elevation view thereof;

FIG. 7 is a left elevation view thereof;

FIG. 8 is a top view thereof;

FIG. 9 is a bottom view thereof; and,

FIG. 10 is a right, front and bottom perspective view thereof. 

CLAIM The ornamental design for a backup alarm, as shown and described. 